Duncan mclean



UNITE STATES PATENT OFFICE- DUNoAN MoLEAN, or WALLAGETOWN, ONTARIO, CANADA.

ROOF ORWALL COVERING.

SPECIFICATION forming partof Letters Patent No. 268,260, dated November 28, 1882.

Application filed April 15, 1882. (N0 specimens.)

To all whom it may concern:

Be it known that I, DUNCAN MGLEAN, of

VVallacetown, in the Province of Ontario and- Dominion of Canada, have invented a new and Improved Roof or Wall Covering, of which the following is a full, clear, and exact description.

My improved composition of matter consists of the following ingredients, mixed in the followingproportions, to wit: hydraulic cement, one barrel; clear sand, three barrels; salt, one-- half bushel; hair and water in sufficient quantities to form good mortar of medium stilT- ness. The salt is dissolved in the water, and the cement and sand are then mixed with the water to form amortar, and the hair is added. This mortar is spread by means ofa trowel to the thickness of about half an inch or more upon the roof, Which must be covered with narrow lumber l'astened on the roof with the joints not too cose, so that some of the mortar can pass into the joints. Then one or more coats of hot gas or coal tar are applied by means of a brush, and as much sand is spread on this coal-tar as it will absorb and hold. This sanded surface is rubbed down smooth by means of a suitable tool, upon which one or more coats of hotco'al or gas tar are applied,

used in this last operation to give the coating a good finish. This coating can be applied on the sides of a building in the same manner, and can be painted any desired color.

This coating is water-proof, fire-proofiand frost-proof, is durable, and can easily be repaired, and is not very expensive. A

Having thus described my' invention, I claim as new and desire to secure by Letters Patent A method of forming a roof or wall covering, which consists in first applying a coat of mortar on a slat frame, then covering this with alternate layers of gas or coal tar and sand, and finally oiling as well as smoothing the outer surface, as described.

DUNCAN MCLEAN. 

